
/// start
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
     Written by James Clark (jjc@jclark.com)

This file is part of groff.

groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with groff; see the file COPYING.  If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

#define INT_DIGITS 19		/* enough for 64 bit integer */

void itoa(char* s, int i)
{
  /* Room for INT_DIGITS digits, - and '\0' */
  char buf[INT_DIGITS + 2];
  buf[INT_DIGITS + 1] = '\0';
  char *p = buf + INT_DIGITS + 1;	/* points to terminating '\0' */
  char *q;
  if (i >= 0) {
    do {
      *--p = '0' + (i % 10);
      i /= 10;
    } while (i != 0);
    for (q = s; *p != '\0'; p++, q++)
      *q = *p;
    *q = *p;
    return;
  }
  else {			/* i < 0 */
    if (i == 0x80000000) {
      unsigned int ui;
      ui = (unsigned int)i; // cannot use i = -i since i can be 0x80000000
      do {
        *--p = '0' + (ui % 10); // bug in original itoa.c
        ui /= 10;
      } while (ui != 0);
    }
    else {
      i = -i;
      do {
        *--p = '0' + (i % 10);
        i /= 10;
      } while (i != 0);
    }
    *--p = '-';
    for (q = s; *p != '\0'; p++, q++)
      *q = *p;
    *q = *p;
  }
  return;
}
